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LEASES - Financial Impact of Leases (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Statement of Financial Position      
Right-of-use assets $ 52,331 $ 70,635  
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] us-gaap:LongTermRightOfUseAssetsMember us-gaap:LongTermRightOfUseAssetsMember  
Finance lease assets $ 302 $ 213  
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] Property Plant And Equipment [Member]    
Operating lease liabilities $ 14,019 19,315  
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] wttr:CurrentOperatingLeaseLiabilitiesMember    
Operating lease liabilities $ 60,984 72,143  
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] wttr:LongTermOperatingLeaseLiabilitiesMember    
Finance lease liabilities $ 307 128  
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List] Finance Lease, Liability    
Finance lease liabilities $ 94 87  
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] wttr:OtherLongTermLliabilitiesMember    
Right-of-use asset impairment $ 3,600 600  
Operating lease cost:      
Operating lease cost - fixed 19,968 27,856  
Lease abandonment costs 4,350 2,073  
Short-term agreements: 44,062 93,949  
Finance lease cost:      
Amortization of leased assets 314 916 $ 1,314
Interest on lease liabilities 14 32  
Sublease income 1,463 1,544  
Lessor income 350 478  
Statement of cash flows      
Cash paid for operating leases 22,385 30,670  
Cash paid for finance leases lease interest 14 32  
Cash paid for finance leases $ 264 $ 883 $ 1,881